HP Comes After a Thousand Years

A boy with the surname Gryffindor came from a thousand years ago. The boy with full buffs came to the Harry Potter time and space a thousand years later, and found that the wizards a thousand years later were really weak. The beginning is the timeline of Harry Potter and the Goblet of Fire Mostly private Author Gryffindor Party, Slytherin is neither black nor white The protagonist is not a pure good person Purpose: Fight for peace